Subversion Repositories planix.SVN

#include "common.h"

/* expand a path relative to some `.' */
extern String *
abspath(char *path, char *dot, String *to)
{
        if (*path == '/') {
                to = s_append(to, path);
        } else {
                to = s_append(to, dot);
                to = s_append(to, "/");
                to = s_append(to, path);
        }
        return to;
}

/* return a pointer to the base component of a pathname */
extern char *
basename(char *path)
{
        char *cp;

        cp = strrchr(path, '/');
        return cp==0 ? path : cp+1;
}

/* append a sub-expression match onto a String */
extern void
append_match(Resub *subexp, String *sp, int se)
{
        char *cp, *ep;

        cp = subexp[se].sp;
        ep = subexp[se].ep;
        for (; cp < ep; cp++)
                s_putc(sp, *cp);
        s_terminate(sp);
}

/*
 *  check for shell characters in a String
 */
static char *illegalchars = "\r\n";

extern int
shellchars(char *cp)
{
        char *sp;

        for(sp=illegalchars; *sp; sp++)
                if(strchr(cp, *sp))
                        return 1;
        return 0;
}

static char *specialchars = " ()<>{};=\\'\`^&|";
static char *escape = "%%";

int
hexchar(int x)
{
        x &= 0xf;
        if(x < 10)
                return '0' + x;
        else
                return 'A' + x - 10;
}

/*
 *  rewrite a string to escape shell characters
 */
extern String*
escapespecial(String *s)
{
        String *ns;
        char *sp;

        for(sp = specialchars; *sp; sp++)
                if(strchr(s_to_c(s), *sp))
                        break;
        if(*sp == 0)
                return s;

        ns = s_new();
        for(sp = s_to_c(s); *sp; sp++){
                if(strchr(specialchars, *sp)){
                        s_append(ns, escape);
                        s_putc(ns, hexchar(*sp>>4));
                        s_putc(ns, hexchar(*sp));
                } else
                        s_putc(ns, *sp);
        }
        s_terminate(ns);
        s_free(s);
        return ns;
}

int
hex2uint(char x)
{
        if(x >= '0' && x <= '9')
                return x - '0';
        if(x >= 'A' && x <= 'F')
                return (x - 'A') + 10;
        if(x >= 'a' && x <= 'f')
                return (x - 'a') + 10;
        return -512;
}

/*
 *  rewrite a string to remove shell characters escapes
 */
extern String*
unescapespecial(String *s)
{
        int c;
        String *ns;
        char *sp;
        uint n;

        if(strstr(s_to_c(s), escape) == 0)
                return s;
        n = strlen(escape);

        ns = s_new();
        for(sp = s_to_c(s); *sp; sp++){
                if(strncmp(sp, escape, n) == 0){
                        c = (hex2uint(sp[n])<<4) | hex2uint(sp[n+1]);
                        if(c < 0)
                                s_putc(ns, *sp);
                        else {
                                s_putc(ns, c);
                                sp += n+2-1;
                        }
                } else
                        s_putc(ns, *sp);
        }
        s_terminate(ns);
        s_free(s);
        return ns;

}

int
returnable(char *path)
{

        return strcmp(path, "/dev/null") != 0;
}